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Design Loop — Autonomous Site Builder · jezweb | DecimalAI

frontendby jezweb

Design Loop — Autonomous Site Builder

jezweb/design-loop

Source jezweb/claude-skills ↗License MIT

Autonomous multi-page site builder using a baton-passing loop. Each iteration reads a task from .design/next-prompt.md, generates a page in HTML/Tailwind, integrates it into the site, verifies visually, then writes the next task to keep the loop alive.

SkillScore80Maintained

Automatic

Frontend / UI pack

Last verified 8/14/2026

What it changes

Passed 17 of 21 test cases with the skill, and 5 of 21 without it.

Without skill24%

With skill80%

Checks it passed that the model alone missed

The response identifies StitchError
The response requires .design/metadata.json to exist
The response lists "GEMINI_3_PRO" and "GEMINI_3_FLASH"

and 17 more in the full report

14 fixed6 passed either way5 still failing0 broke

Pass-rate lift: +56 pp
Tokens: +268%
Agent turns: 0%
Response time: -61%

Model gemini-3.6-flashMeasured 8/14/2026v120 of 25 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jezweb-design-loop/SKILL.md https://app.decimal.ai/s/jezweb-design-loop/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jezweb-design-loop, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jezweb-design-loop/ and pins it in .decimal/skills.lock

decimalai skills add jezweb-design-loop

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jezweb-design-loop/SKILL.md https://app.decimal.ai/s/jezweb-design-loop/SKILL.md

Raw file: /s/jezweb-design-loop/SKILL.md ↗ · machine-readable summary at /s/jezweb-design-loop.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 13

Prompt

What is the single required YAML frontmatter field in .design/next-prompt.md that designates the target output filename without extension?

What was checked, without and with the skill
Checked	Without skill	With skill
The response specifies page as the required YAML frontmatter field	Missed	Passed

case-18 · gemini-3.6-flash · 8/14/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md514 linessingle file

Design Loop — Autonomous Site Builder

Build complete multi-page websites through an autonomous loop. Each iteration reads a task, generates a page, integrates it, verifies it visually, then writes the next task to keep going.

Overview

The Design Loop uses a "baton" pattern — a file (.design/next-prompt.md) acts as a relay baton between iterations. Each cycle:

Reads the current task from the baton
Generates the page (via Claude or Google Stitch)
Integrates into the site structure (navigation, links)
Verifies visually via browser automation (if available)
Updates site documentation
Writes the NEXT task to the baton — keeping the loop alive

This is orchestration-agnostic. The loop can be driven by:

Human-in-loop: User reviews each page, then says "next" or "keep going"
Fully autonomous: Claude runs continuously until the site is complete
CI/CD: Triggered on .design/next-prompt.md changes

Generation Backends

Backend	Setup	Quality	Speed	Best for
Claude (default)	Zero dependencies	Great — production-ready HTML/Tailwind	Fast	Most projects, full code control
Google Stitch	`npm install @google/stitch-sdk` + API key	Higher fidelity AI designs	~10-20s/screen	Design-heavy projects, visual polish

Detecting Stitch

At the start of each loop, check if Stitch is available:

Check if @google/stitch-sdk is installed: ls node_modules/@google/stitch-sdk 2>/dev/null
Check if STITCH_API_KEY is set in .dev.vars or environment
Check if .design/metadata.json exists (contains Stitch project ID)

If all three are present, use Stitch. Otherwise, fall back to Claude generation.

Stitch SDK Reference

Install: npm install @google/stitch-sdk. Set STITCH_API_KEY in environment or .dev.vars.

Track record

Benchmark

17 / 21

test cases passed, vs 5 / 21 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jezweb / claude-skills

plugins/frontend/skills/design-loop/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

sickn33/stitch-loopTeaches agents to iteratively build websites using Stitch with an autonomous baton-passing loop patternClose match+50 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Design Loop — Autonomous Site Builder

Overview

Generation Backends

Detecting Stitch

Stitch SDK Reference

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills